[Rev 01] RFR: 8238434: Ensemble: Update version of Lucene to 7.7.2

[Kevin Rushforth]

> Update the version of Lucene used by Ensemble to the latest release of Lucene 7 which is version 7.7.2.
> 
> Per the instructions in [`UPDATING-lucene.txt`](https://github.com/openjdk/jfx/blob/master/apps/samples/Ensemble8/UPDATING-lucene.txt), I made the following chages:
> 
> 1. Bumped the version numbers from 7.7.1 to 7.7.2 in all needed places
> 2. Regenerated the index files. I used JDK 11.x to do this (out of an abundance of caution, not because I think it matters).
> 
> To test this: apply the patch, run `gradle apps`, launch Ensemble8, and search for a sample or JavaFX component in the upper-right search box.

The pull request has been updated with 1 additional commit.

-------------

Added commits:
 - 6facff5d: Revert changes to binary index files (we do not need to regenerate them)

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/105/files
  - new: https://git.openjdk.java.net/jfx/pull/105/files/efb46435..6facff5d

Webrevs:
 - full: https://webrevs.openjdk.java.net/jfx/105/webrev.01
 - incr: https://webrevs.openjdk.java.net/jfx/105/webrev.00-01

  Stats: 3 lines in 6 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jfx/pull/105.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/105/head:pull/105

PR: https://git.openjdk.java.net/jfx/pull/105